Grounding - Aros APPENDIX 1500 Manual De Instrucciones

5.5

Grounding

Since PV modules have a parasitic capacitor with respect to ground, in a plant
employing transformerless inverters, like this product, it is normal to have
capacitive leakage currents towards earth. The maximum allowable amount of
these currents is 300mA. In order to warrant the electrical safety, the maximum
allowable voltage on ground nodes is 50V, so the ground rod must have
resistance less than 160Ω in case of a single inverter or resistance less than
50 [V ]
R [Ω ]
PE
n·0.3[ A]
inverter and the mounting structures of PV modules to the same ground. In case
the modules and the inverter are part of a building, it is mandatory to have only
one ground network. In case in the plant are present devices able to inject huge
currents to earth, like arc welders, automatic facilities, big uninterruptable power
supplies, etc. the ground rod have to be adequate.
In transformerless inverters, like this product, it is not allowed the ground
connection of any part of the photovoltaic generator. In case modules require
this connection, it means that this inverter is not suitable for the application.
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where "n" is the number of inverters. It is allowed to connect the